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Has anyone used an attenuator with DisEQC switch?

In my setup, I have 3 LNBs feeding into a DisEQC switch. The setup works almost fine. I can switch from SAT A to SAT B or SAT C. I can also switch from SAT B to SAT A or SAT C. However, once I am on SAT C, switching does not work anymore. I just get locked into SAT C.

Someone suggested to me that the LNB on SAT C is drawing lot of power. Hence, the DisEQC is not able to switch. This person also suggested that I insert a 10 Db Attenuator between the LNB and the DisEQC switch.

I am wondering if anyone had a similar problem and was solved using the attenuator.